1.4.0

• IMPORTANT: Previously, the pure Python reader would allow
  ipaddress.IPv4Address and ipaddress.IPv6Address objects when calling
  .get(). This would fail with the C extension. The fact that these objects
  worked at all was an implementation detail and has varied with different
  releases. This release makes the pure Python implementation consistent
  with the extension. A TypeError will now be thrown if you attempt to
  use these types with either the pure Python implementation or the
  extension. The IP address passed to .get() should be a string type.
• Fix issue where incorrect size was used when unpacking some types with the
  pure Python reader. Reported by Lee Symes. GitHub #30.
• You may now pass in the database via a file descriptor rather than a file
  name when creating a new maxminddb.Reader object using MODE_FD.
  This will read the database from the file descriptor into memory. Pull
  request by nkinkade. GitHub #33.